Control-switch for electrically-operated measuring apparatus.



0. ANDERSON.

CONTROL SWITCH FOR ELECTHICALLY OPERATED MEASURING APPARATUS.

APPLICATION FILED NOV-11.1916.

Patented Jan. 21, 1919.

UNITED STATES PATENT OFFICE.

OSCAR ANDERSON, OF RAS'UNDA, SWEDEN.

CONTROL-SWITCH FOR ELECTRICALLY-OPERA'IED MEASURING APPARATUS.

Specification of Letters Patent. 2 I Patented J an. 21, 1919.

Application filed November 11, 1918. Serial No. 130,926.

To all whom it may concern:

Be it known that I, OsoAn ANDERSON, a

citizen of the Kingdom of Sweden, residing at Rasunda, Sweden, have invented new and useful Improvements in Control-Switchesfor Electrically-Operated Measuring Apparatus, of which the followlng is a specification.

This invention relates to a control switch for electrically operated measuring appa-' ratus, especially such apparatus adapted to measure certain quantities of liquids,.pow-

dered materials or the like. In apparatus of that kind it is frequently desirable, that the apparatus be so adjusted, that, after a certain number of measurements, it is automatically made inoperative.

One object of this invention is the provision of a control switch, by means of which a measuring apparatus of the type above specified may be made inoperative af ter any desired number of measurements.

A further object consists in the provision of a control switch of the said kind provided with an electromagnetic escapement wheel mechanism designed to be put in the control circuit of the measuring apparatus and comprising an escapement wheel adapted, in a certain position, to break said circuit.

A preferred embodiment of the invention is illustrated in the accompanying drawing in which Figure 1 is a front View of the switch with remot ed cover. Fig. 2 is a sectional view on line AA in Fig. 1 Fig. 3 is a front view of the switch with the cover in place, and Fig. 4 is a section on line 13-13 in Fi 1'. V

In the construction shown, the control switch comprises an escapement wheel mechanism consisting of an escapement wheel 1 and a double-armed pawl 2. The esca ement wheel is pivotally mounted on a she 3 and actuated by a spring 4 tending to hold the wheel in a certain position. The

pawl 2 is pivoted to a shaft 5 and secured to the armature 6 of an electromagnet 7.

' A spring 20 tends to hold the pawl in the osition in which the armature 6 is removed om the electromagnet 7 The circuit of the electromagnet comprises two contact springs 8 and 9, the former 8 of which extends into the path of movement of a projection 10 secured to" the wheel 1. The contact spring 8, which, owing to its elasticity,

tends to be in contact with the spring 9, is

normally kept out of contact with the latter by means of a shoulder 11 formed on a spring 12 (Fig. 4). I

All the members above mentioned are inclosed in a casing 13 provided with a. cover 14. The shaft 3, which extends through said cover, supports outside the same a pointer 15, which is to bejoperated byhand and is connected with the wheel 1, so that, on turning the pointer, the wheel is turned at the same time. The pointer may be adjusted to any one of the positions indicated by the figures 0 to 10 (Fig. 3). A stop-pin i 16, Fig. 2, may be inserted into holes formed in the cover 14, so as to prevent the pointer from passing a certain position. Passed through the cover 14 is a pin 19 provided with a spring-actuatedpush-button 18 and serving to so actuate the spring catch 12, that the contact spring 8 is released.

The switch described above is designed to control the number of consecutive measuremen'ts effected by electrically controlled apparatus for measuring certain quantities of liquids, powdered materials and the like, as for instance a fluid measuring apparatus of the kind described in my patent application Serial Number 15110, filed March 1'2, 1915. In said measuring apparatus the circuit of the apparatus is closed, as soon as certain contacts in the apparatus are closed. Then the apparatus is capable of performing a measuring operation, during which the circuit is again broken and remains broken,

until the apparatus is ready for the next measuring operation.

The electromagnet 7 and the contacts 8, 9 are connected in wries with said circuit of the measuring apparatus.

If for instance, the measuring apparatus shall effect five measurements and then be cuit of the electromagnet 7 is closed and broken one time at the first measuring operation, and owing thereto the armature 6 is attracted and released one time, so that the pawl 2 is caused tomove to and fro one time, and during this movement of the awl the spring 4 turns the wheel 1 from position 5 to position 4.

When the circuit of the measuring apparatus isv again closed and broken at the next measuring operation, the armature 6 is anew attracted and released, and the wheel 1 is caused to move to position 3 and so on.

When after the fifth measuring operation I claim as new and desire to secure by Letters Patent is:

A control switch for electrically operated liquid measuring apparatus, comprising a closed casing, a rotatably mounted wheel Within said casing, an operating pointer for said Wheel outside said casing, a retracting spring for said wheel, a spring-operated pawl to control the retracting movement of said Wheel, an electro-magnet to control said pawl, connections to connect the electromagnet to the circuit of the measuring apparatus to be controlled, contact springs in said connections, manually operable means for initially closing said springs, and means on the rotatable wheel to open the springs in a certain position of the wheel.

In testimony whereof I have signed my name.

OSCAR ANDERSON. 

